lh3/fermi — comment on commit ea1d97ce1453950c6dfb3f16d6261043b5a5c51d
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By lh3:

This is mainly due to the unitig construction method fermi is using. Fermi labels a read with two integers: the smallest rank of the forward sequence and the smallest rank of the reverse sequence. Thus a read whose forward and reverse strands are identical will be labeled by a pair of identical integers. This causes problems in graph cleaning as it assumes each integer is unique. There are other solutions to this problem, but making sure there are no reads having identical forward/reverse sequences is the simplest.